Civil Engineering Eligibility

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I've provided enough details regarding cutoff to save you plenty of time looking around. Assuming you already know enough about the two exams, I'll just mention important bits to know the difference between the two exams better.
Number of applicants in COMEDK'18: 72,152 (against 20,000 seats, out of which 18733 are reserved for engineering)
Number of applicants in KCET'18: 1,98,639 (against 19942 seats, out of which 16942 are reserved for engineering)
Both exams are different in the following ways:
More competition in KCET, compared to COMEDK.
Tough COMEDK, easier to get a good rank, whereas the opposite is true for KCET.
COMEDK colleges more expensive than KCET (this is because COMEDK has more private affiliation) [53,460 (KCET seat) and 1,83,600 (COMEDK seat)]
Reservations for SC/ST/OBC high in KCET, more seats for GEN in COMEDK.
Outsiders not allowed to write KCET, whereas COMEDK is all-India EE.
Keeping the above points in mind, let's look at the cutoffs.
Generally, the closing rank in KCET for RVCE:
Civil: 3354
CSE: 573
ECE: 798
EE: 622
ME: 584
Now, COMEDK for RVCE:
Civil: 3199
CSE: 180
ECE: 390
EE: 732
ME: 829
From the above tables, we can suppose that KCET which see a number of applicants higher than that of COMEDK, but yet latter has a similar cut off as KCET but for less number of candidates. Although one can't exactly tell what should be your rank to be able to get a seat in RV college of engineering as the last year cutoffs can't exactly predict your chances as the cutoffs are based on so many factors so it isn't ever constant.
But to be on safe side, its best if you have:
Civil: 2500 (COMEDK), 2700 (KCET)
CSE: 150 (COMEDK), 300 (KCET)
ECE: 300 (COMEDK), 300 (KCET)
EE: 600 (COMEDK), 500 (KCET)
ME: 700 (COMEDK), 500 (KCET)
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Yes, you are eligible for AFCAT. The candidates who are studying in the final year/ semester Degree course and are yet to pass the final year degree examination can also apply provided candidate should not have any present backlog and should have secured a minimum of 60% marks up to the last semester/ year for which results have been declared up to the time of submission of application. They are required to submit proof of passing the Degree as per notification and no request for extending this date will be entertained on the grounds of late conduct of basic qualifying University Examination, delay in declaration of results or any other ground whatsoever.

Hello,
It is very nice to hear from you that you are interested in going to Canada for your best of engineering studies after completion of your Diploma in India. Admissions abroad are normally given for undergraduate courses after qualifying 12th standard but then Diploma is also considered as equivalent of class 12th. Hence, I feel there should be no problem for you to get admission in a University in Canada. However, the admissions there are not exclusively based on academics but depend on host of other factors. In view of this I would like to strongly advise you to approach an agency dealing with sending students for undergraduate studies to Canada as they will be knowing what different preparations you need to do and plug your CV of any deficiencies if sny. Best wishes to you.